Question

At anaphase of meiosis, some chromosome lag behind. They are called laggards. This is due to
A. Inversion of chromosomes
B. Acentric chromosome
C. Dicentric chromosome
D. Duplication of genes

Answer 1

Hint: There are three kinds of cell division, they are mitosis, meiosis and amitosis. Mitosis is the division of somatic cells. Meiosis is the two-stage cell division in which the chromosome number of the parent cell is reduced by half meiosis is the process by which gametes are formed.

Complete Answer:
Cell division process by which a parent cell splits into two or more daughter cells. All cells are derived from pre- exiting cells.

Stages of meiosis:
Meiosis I: Prophase I, Metaphase I, Anaphase I and Telophase I
Meiosis II: Prophase II, Metaphase II, Anaphase II and Telophase II

- Anaphase I is the chromosomes of each homologous pair that start to separate from each other. In anaphase I, the chromosomes move towards the opposite poles.
- Centromere is an important structure for binding of chromosomes to spindle fibers. Centromere possesses kinetochore discs for binding to the spindle fibers.
- Chromosomes lacking centromere are known as an acentric chromosome. Acentric is called a laggard. Since acentric chromosomes lack centromere, they cannot bind to spindle fibers and are frequently lost by daughter cells produced. This provides rise to unbalanced progeny cells and unbalanced gametes are produced.

Thus, the option (B) is correct.

Note: Meiosis was discovered and explained for the first time in sea urchin eggs in 1876 by the German biologist Oscar hertwig. Mitosis produces two genetically identical cells. Mitosis is referred to as the same as meiosis. Gametes are a reproductive cell of organisms. Male gametes are sperm, female gametes are ovum.